Writing board



FIG. 1 is a front view of a writing board of my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a right side view thereof.

The broken lines in the drawings are included for the purpose of showing features of the writing board that form no part of the claimed design. 

CLAIM The ornamental design for a writing board, as shown and described. 